In doing research for this question, I found out that the Playstation console tags have a bit too much redundancy in the curent tagging system, with their abbreviated forms not being attributed to the full name of the consoles. (Or vice versa. I'm not sure which should be the prime tags)
To expand a little on Powerlord's comment, the original PlayStation was called PlayStation with "PS" or "PSX" being the shortened form: not PlayStation 1, PlayStation One, or PS1 (Wikipedia claims PS1 is an alternate form, but it's unsourced).
PSOne was the slimmer, value version of the PlayStation released when the PlayStation 2 came out.
So, if we're going to resolve this once and for all, I propose:
- psx, ps1, playstation-one, psone, playstation-1 → playstation
- ps2 → playstation-2
- ps3 → playstation-3
- psp → playstation-portable
We'll probably have to revisit this one more time when the PlayStation Vita starts being tossed around more colloquially. Likely:
I think the abbreviated forms are very well-known among gamers, plus SE in general favors short tags when the abbreviation is popular, so I'd like to invert Mark's suggestion:
- psx, playstation-one, psone, playstation-1 → ps1
- playstation-2 → ps2
- playstation-3 → ps3
- playstation-portable → psp
Notice that I've removed playstation from the list altogether - that's because that although the actual name of the first console of the series was "playstation", I think that new users posting questions might think "well, it's about my playstation, let's tag it with playstation", even though it's actually a ps3 that they own. Removing this tag altogether means that when a user starts writing "plays..." 3 major options will appear - playstation-1, playstation-2 and playstation-3, so it's very clear which one should be used.