Fam

"Fam" was a term that the Thirteenth Doctor had taken to calling her companions.

She initially considered the name along with "troops", "team", and "gang". (TV: The Woman Who Fell to Earth, Arachnids in the UK) Despite later settling with the term team TARDIS, (TV: Arachnids in the UK) she brought up the possibility again, which was rejected by her companions. (TV: The Witchfinders) The next time she brought it up, Yasmin Khan expressed some liking to it, but Ryan Sinclair and Graham O'Brien were still not convinced. (TV: The Battle of Ranksoor Av Kolos)

When Lin, Mitch and Aaron tagged along with Team TARDIS, she referred to the whole group as her "extended fam". (TV: Resolution)

She addressed her three companions this way when talking on the phone (TV: Spyfall) and when giving them orders. (TV: Ascension of the Cybermen) Upon regaining consciousness, she called them "[her] fam". (TV: The Timeless Children)

She even addressed all thirteen of her predecessors this way when speaking with them over the TARDIS' telepathic circuits; the Sixth Doctor was outraged upon hearing the word, while the Tenth Doctor expressed his liking for it. (WC: Doctors Assemble!)

When Graham O'Brien and Ryan Sinclair left the TARDIS, the Doctor gave a mournful "bye fam" during a group hug. (TV: Revolution of the Daleks)