<SN> is for any special ship name, not the player's ship
<PSN> is for teh player's ship name. Which is the one changed by Txxx
From the Nova Bible
Whenever Nova displays a desc resource related to a mission, such as the
initial mission description (desc ID 4000-4255) or one of the special mission
briefings (e.g. CompText and QuickBrief) it performs one other special operation
on the text. It searches through the text and replaces a few special "wildcard"
symbols with pertinent mission information. This is extremely useful in setting
up mission briefings that include random information that wouldn't be known when
the description is written. These special symbols and their expansions are:
<DSY> The name of the destination system
<DST> The name of the destination stellar
<RSY> The name of the return system
<RST> The name of the return stellar
<CT> The name of the type of cargo to be carried
<CQ> The quantity of cargo to be carried
<DL> The date of the mission deadline, if any
<PAY> Absolute value of mission pay (does nothing if the mission pay
isn't monetary)
<REG> Who Nova is registered to, or "UNREGISTERED"
<PN> The player's name
<PNN> The player's nickname. If no nickname was specified, Nova will use
the player's full name here instead.
<PSN> The player's ship's name
<PST> The player's ship type (comes from the resource name of the player's
ship type's shďp resource)
<PRK> The ConvName of the highest-weighted active rank resource. If none
is found, this will be replaced with "captain".
<SRK> The ShortName of the highest-weighted active rank resource. If none
is found, this will be replaced with "captain".
<PRKnnn> Same as <PRK>, but only for ranks affiliated with government ID nnn.
Note that you can only do this once per description, or bad things
might happen.
<SRKnnn> Same as <SRK>, but only for ranks affiliated with government ID nnn.
Note that you can only do this once per description, or bad things
might happen.
<RRK> The full name of the most recently activated rank resource. Note
that it's best to only use this in a mission briefing where you
know that you've just given the player a rank, because otherwise
bad things could happen. (e.g. the most recently activated rank
pointer isn't cached between game sessions)
<OSN> The offering ship name (only works when offering a mission from a
ship)
<SN> Special ship name (Note: Nova will screw up if you use this in the
initial mission description, as it doesn't pick the special ship
names until you actually accept the mission.)