Control character names (^X) are writte boldface, without quotes.

man3/termios.3

@@ -397,10 +397,11 @@ If \fBICANON\fP is also set, echo the NL character even if ECHO is not set.
 .TP
 .B ECHOCTL
 (not in POSIX) If \fBECHO\fP is also set, ASCII control signals other than
-TAB, NL, START, and STOP are echoed as ^X, where X is the character with
+TAB, NL, START, and STOP are echoed as \fB^X\fP,
+where X is the character with
 ASCII code 0x40 greater than the control signal.
 For example, character
-0x08 (BS) is echoed as ^H.
+0x08 (BS) is echoed as \fB^H\fP.
 [requires
 .B _BSD_SOURCE
 or

man4/console_codes.4

@@ -91,26 +91,27 @@ The recognized control characters are BEL, BS, HT, LF, VT, FF,
 CR, SO, SI, CAN, SUB, ESC, DEL, CSI.
 They do what one would expect:
 .HP
-BEL (0x07, ^G) beeps;
+BEL (0x07, \fB^G\fP) beeps;
 .HP
-BS (0x08, ^H) backspaces one column
+BS (0x08, \fB^H\fP) backspaces one column
 (but not past the beginning of the line);
 .HP
-HT (0x09, ^I) goes to the next tab stop or to the end of the line
+HT (0x09, \fB^I\fP) goes to the next tab stop or to the end of the line
 if there is no earlier tab stop;
 .HP
-LF (0x0A, ^J), VT (0x0B, ^K) and FF (0x0C, ^L) all give a linefeed,
+LF (0x0A, \fB^J\fP), VT (0x0B, \fB^K\fP) and
+FF (0x0C, \fB^L\fP) all give a linefeed,
 and if LF/NL (new-line mode) is set also a carriage return;
 .HP
-CR (0x0D, ^M) gives a carriage return;
+CR (0x0D, \fB^M\fP) gives a carriage return;
 .HP
-SO (0x0E, ^N) activates the G1 character set;
+SO (0x0E, \fB^N\fP) activates the G1 character set;
 .HP
-SI (0x0F, ^O) activates the G0 character set;
+SI (0x0F, \fB^O\fP) activates the G0 character set;
 .HP
-CAN (0x18, ^X) and SUB (0x1A, ^Z) interrupt escape sequences;
+CAN (0x18, \fB^X\fP) and SUB (0x1A, \fB^Z\fP) interrupt escape sequences;
 .HP
-ESC (0x1B, ^[) starts an escape sequence;
+ESC (0x1B, \fB^[\fP) starts an escape sequence;
 .HP
 DEL (0x7F) is ignored;
 .HP
@@ -376,7 +377,8 @@ b) VT100 graphics \-> PC, c) PC \-> PC, d) user-defined.
 .PP
 There are two character sets, called G0 and G1, and one of them
 is the current character set. (Initially G0.)
-Typing ^N causes G1 to become current, ^O causes G0 to become current.
+Typing \fB^N\fP causes G1 to become current,
+\fB^O\fP causes G0 to become current.
 .PP
 These variables G0 and G1 point at a translation table, and can be
 changed by the user.
@@ -461,9 +463,9 @@ NUL (0x00) was ignored;
 .HP
 ENQ (0x05) triggered an answerback message;
 .HP
-DC1 (0x11, ^Q, XON) resumed transmission;
+DC1 (0x11, \fB^Q\fP, XON) resumed transmission;
 .HP
-DC3 (0x13, ^S, XOFF) caused VT100 to ignore (and stop transmitting)
+DC3 (0x13, \fB^S\fP, XOFF) caused VT100 to ignore (and stop transmitting)
 all codes except XOFF and XON.
 .LP
 VT100-like DC1/DC3 processing may be enabled by the tty driver.

man4/tty_ioctl.4

@@ -304,9 +304,8 @@ TIOCPKT_FLUSHREAD   The read queue for the terminal is flushed.
 TIOCPKT_FLUSHWRITE  The write queue for the terminal is flushed.
 TIOCPKT_STOP        Output to the terminal is stopped.
 TIOCPKT_START       Output to the terminal is restarted.
-TIOCPKT_DOSTOP      t_stopc is \(aq^S\(aq and t_startc is \(aq^Q\(aq.
-TIOCPKT_NOSTOP      The start and stop characters are not
-                    \(aq^S\(aq/\(aq^Q\(aq.
+TIOCPKT_DOSTOP      The start and stop characters are \fB^S\fP/\fB^Q\fP.
+TIOCPKT_NOSTOP      The start and stop characters are not \fB^S\fP/\fB^Q\fP.
 .fi
 
 While this mode is in use, the presence
@@ -320,7 +319,7 @@ This mode is used by
 and
 .BR rlogind (8)
 to implement a remote-echoed,
-locally \`^S\(aq/\(aq^Q\(aq flow-controlled remote login.
+locally \fB^S\fP/\fB^Q\fP flow-controlled remote login.
 
 The BSD ioctls
 .BR TIOCSTOP ,

man5/termcap.5

@@ -114,7 +114,7 @@ NR	ti does not reverse te
 nx	No padding, must use XON/XOFF
 os	Terminal can overstrike
 ul	Terminal underlines although it can not overstrike
-xb	Beehive glitch, f1 sends ESCAPE, f2 sends ^C
+xb	Beehive glitch, f1 sends ESCAPE, f2 sends \fB^C\fP
 xn	Newline/wraparound glitch
 xo	Terminal uses xon/xoff protocol
 xs	Text typed over standout text will be displayed in standout
@@ -206,7 +206,7 @@ AL	Insert %1 lines
 ac	Pairs of block graphic characters to map alternate character set
 ae	End alternative character set
 as	Start alternative character set for block graphic characters
-bc	Backspace, if not ^H
+bc	Backspace, if not \fB^H\fP
 bl	Audio bell
 bt	Move to previous tab stop
 cb	Clear from beginning of line to cursor
@@ -372,7 +372,7 @@ ve	Normal cursor visible
 vi	Cursor invisible
 vs	Standout cursor
 wi	Set window from line %1 to %2 and column %3 to %4
-XF	XOFF character if not ^S
+XF	XOFF character if not \fB^S\fP
 .fi
 .LP
 There are several ways of defining the control codes for string capabilities:
@@ -380,7 +380,7 @@ There are several ways of defining the control codes for string capabilities:
 Every normal character represents itself,
 except \(aq^\(aq,\(aq\e\(aq and \(aq%\(aq.
 .LP
-A \(aq^x\(aq means Control-x.
+A \fB^x\fP means Control-x.
 Control-A equals 1 decimal.
 .LP
 \ex means a special code.

man7/charsets.7

@@ -311,7 +311,7 @@ It uses codes either
 G0 always has size 94 and uses codes 041-0176.
 .LP
 Switching between character sets is done using the shift functions
-^N (SO or LS1), ^O (SI or LS0), ESC n (LS2), ESC o (LS3),
+\fB^N\fP (SO or LS1), \fB^O\fP (SI or LS0), ESC n (LS2), ESC o (LS3),
 ESC N (SS2), ESC O (SS3), ESC ~ (LS1R), ESC } (LS2R), ESC | (LS3R).
 The function LS\fIn\fP makes character set G\fIn\fP the current one
 for codes with high bit zero.
@@ -348,7 +348,7 @@ recent version selected by ESC & @ ESC $ B.
 ISO 4873 stipulates a narrower use of character sets, where G0
 is fixed (always ASCII), so that G1, G2 and G3
 can only be invoked for codes with the high order bit set.
-In particular, ^N and ^O are not used anymore, ESC ( xx
+In particular, \fB^N\fP and \fB^O\fP are not used anymore, ESC ( xx
 can be used only with xx=B, and ESC ) xx, ESC * xx, ESC + xx
 are equivalent to ESC \- xx, ESC . xx, ESC / xx, respectively.
 .SH "SEE ALSO"