jot

Short definition from Wiktionary

Noun

1. 1
   The smallest letter or stroke of any writing; an iota.
2. 2
   A small, or the smallest, amount of a thing; a bit, a whit.
3. 3
   A small, or the smallest, amount of a thing; a bit, a whit: An instant, a moment.
4. 4
   A brief and hurriedly written note.
5. 5
   A jerk, a jolt.

Verb

1. 1
   Chiefly followed by down: to write (something) quickly; to make a brief note of (something).
2. 2
   To jerk or jolt (something); to jog.