Real Dictionary

jot
verb: If you jot something short such as an address somewhere, you write it down so that you will remember it.

jot in American English
a trifling amount; the smallest bit
to make a brief, quick note of
noun: the least part of something; a little bit
transitive verb: to write or mark down quickly or briefly

jot in British English
noun: a little bit (in phrases such as not to care (or give) a jot)
verb: to write a brief note of