This is what happens when you become an English teacher instead of an engineer

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Sitting in the teachers' office one day...

my colleague: "Hey guys, one of the students sent me a text message- do you know what this means? She asked what the difference is between 'VI' and 'VT' and how do we know when to use them."

me: "'VI' and 'VT' ... oh! Initial velocity, and velocity at a point in time t. Is this a physics problem?"

colleague: "no."

another colleague: "Maybe the 'V' is verbs?"

me: "Oh yeah, isn't there something like... transitive verbs? And... 'VI'..."

colleague: "Oh, transitive and intransitive. Got it."