WP:T is a former shortcut to Wikipedia's tutorial. There are several tutorials:

• Wikipedia:Tutorial (historical), an older version, now preserved for historical reference (target of the shortcut prior to September 2020)
• Help:Introduction, the newer, up-to-date tutorial
• Wikipedia:The Wikipedia Adventure

WP:T could also be taken to stand for:

• Wikipedia:Teahouse, a place to ask a question or get help editing
• Wikipedia:Tips, a collection of tips for editing
• Wikipedia:Tools, a list
• Wikipedia:Templates – templates are pages that are embedded (transcluded) into other pages to allow for the repetition of information
• Wikipedia:Talk page guidelines
• Wikipedia:Task Center
• Wikipedia:Requested moves/T, a shortcut

• All pages with titles beginning with Wikipedia:T