To find out what a particular letter means, you must arrive at this list
why generic means because the first column has no markup.
As mdoc(7) 'constant symbol' the lookup is much quicker, e.g.
man -Otag=h route
makes this the first line in the pager:
M RTF_MODIFIED Modified dynamically (by redirect).
Route flags that now produce an already existing tag don't conflict, i.e.
":tT" first shows
-T rtable
Select an alternate routing table to modify or query. The
and then on second "t"
T RTF_MPLS MPLS route.
OK?
Index: route.8
===================================================================
RCS file: /cvs/src/sbin/route/route.8,v
retrieving revision 1.117
diff -u -p -r1.117 route.8
--- route.8 18 Mar 2023 11:44:53 -0000 1.117
+++ route.8 5 Apr 2023 12:56:12 -0000
@@ -401,27 +401,27 @@ Within the output of
the "Flags" column indicates what flags are set on the route.
The mapping between letters and flags is:
.Bl -column "1" "RTF_BLACKHOLE" "Protocol specific routing flag #1."
-.It 1 Ta Dv RTF_PROTO1 Ta "Protocol specific routing flag #1."
-.It 2 Ta Dv RTF_PROTO2 Ta "Protocol specific routing flag #2."
-.It 3 Ta Dv RTF_PROTO3 Ta "Protocol specific routing flag #3."
-.It B Ta Dv RTF_BLACKHOLE Ta "Just discard packets."
-.It b Ta Dv RTF_BROADCAST Ta "Correspond to a local broadcast address."
-.It C Ta Dv RTF_CLONING Ta "Generate new routes on use."
-.It c Ta Dv RTF_CLONED Ta "Cloned routes (generated from RTF_CLONING)."
-.It D Ta Dv RTF_DYNAMIC Ta "Created dynamically (by redirect)."
-.It G Ta Dv RTF_GATEWAY Ta "Dest requires forwarding by intermediary."
-.It H Ta Dv RTF_HOST Ta "Host entry (net otherwise)."
-.It h Ta Dv RTF_CACHED Ta "Referenced by gateway route."
-.It L Ta Dv RTF_LLINFO Ta "Valid protocol to link address translation."
-.It l Ta Dv RTF_LOCAL Ta "Correspond to a local address."
-.It M Ta Dv RTF_MODIFIED Ta "Modified dynamically (by redirect)."
-.It m Ta Dv RTF_MULTICAST Ta "Correspond to a multicast address."
-.It n Ta Dv RTF_CONNECTED Ta "Interface route."
-.It P Ta Dv RTF_MPATH Ta "Multipath route."
-.It R Ta Dv RTF_REJECT Ta "Host or net unreachable."
-.It S Ta Dv RTF_STATIC Ta "Manually added."
-.It T Ta Dv RTF_MPLS Ta "MPLS route."
-.It U Ta Dv RTF_UP Ta "Route usable."
+.It Dv 1 Ta Dv RTF_PROTO1 Ta "Protocol specific routing flag #1."
+.It Dv 2 Ta Dv RTF_PROTO2 Ta "Protocol specific routing flag #2."
+.It Dv 3 Ta Dv RTF_PROTO3 Ta "Protocol specific routing flag #3."
+.It Dv B Ta Dv RTF_BLACKHOLE Ta "Just discard packets."
+.It Dv b Ta Dv RTF_BROADCAST Ta "Correspond to a local broadcast address."
+.It Dv C Ta Dv RTF_CLONING Ta "Generate new routes on use."
+.It Dv c Ta Dv RTF_CLONED Ta "Cloned routes (generated from RTF_CLONING)."
+.It Dv D Ta Dv RTF_DYNAMIC Ta "Created dynamically (by redirect)."
+.It Dv G Ta Dv RTF_GATEWAY Ta "Dest requires forwarding by intermediary."
+.It Dv H Ta Dv RTF_HOST Ta "Host entry (net otherwise)."
+.It Dv h Ta Dv RTF_CACHED Ta "Referenced by gateway route."
+.It Dv L Ta Dv RTF_LLINFO Ta "Valid protocol to link address translation."
+.It Dv l Ta Dv RTF_LOCAL Ta "Correspond to a local address."
+.It Dv M Ta Dv RTF_MODIFIED Ta "Modified dynamically (by redirect)."
+.It Dv m Ta Dv RTF_MULTICAST Ta "Correspond to a multicast address."
+.It Dv n Ta Dv RTF_CONNECTED Ta "Interface route."
+.It Dv P Ta Dv RTF_MPATH Ta "Multipath route."
+.It Dv R Ta Dv RTF_REJECT Ta "Host or net unreachable."
+.It Dv S Ta Dv RTF_STATIC Ta "Manually added."
+.It Dv T Ta Dv RTF_MPLS Ta "MPLS route."
+.It Dv U Ta Dv RTF_UP Ta "Route usable."
.El
.Pp
.It Xo
