Returns the player's AccountID aka SteamID3. ([U:1:AccountID])

For bots this will return values starting with 0 for the first bot, 1 for the second bot and so on.

See Player:SteamID for the text representation of the full SteamID. See Player:SteamID64 for a 64bit representation of the full SteamID.

Unlike other variations of SteamID, SteamID3 does not include the "Account Type" and "Account Instance" part of the SteamID.