Every Doctor has had a phrase, or quirk to identify them, just as they've all had names.
The Grump, the Hobo, the Dandy, the Bohemian, the Cricketer, the Joker, the Professor, the Victorian...
Doddering. "Hmmn. Hmmn. Hmmn." "Yes." Radioactive cinder. Grandfather. Irascible. Lapels. Ormulu clock. Querulous. Fast return switch.
Cosmic hobo. Baggy trousers. "When I say run." Recorder. Stovepipe hat. Twinkling eyes. Butterfingers.
Dandy. Yellow car. Purple velvet. UNIT Family. Venusian karate. "Reverse the polarity" Whomobile. Action by HAVOC. All wearing eyepatches.
Teeth and curls. Jelly babies. Lovable robot dog. "Ahhhhh-har." Scarf. "Have I the right?"
Cricketer. "Brave heart, Tegan." Pleasant, open face. Wet vet. Kamelion. Celery. Master's cunning disguises.
Brash. Cat badge. Valeyard. Carrot juice. Carrot juice. Carrot juice
Spoons. Braces. Cartmel masterplan. Panama hat. Umbrella. "Ace!" Rrrrrolling rrrrrrs. Professor! Wicked! Cliffhanger. Pullover. Dark and mysterious. Burnt toast.
Kissing. Shoes. Beryllium clock. Half human. "Who am I?" Eye of harmony. Nice TARDIS.