How it works
Asdfghjkl;' is the home row of a keyboard, read left to right. The clock runs over its nine letters, from your A to your L, and reads to a hundredth of a second.
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Nine keys, seven fingers
A, S, D and F sit under the left little, ring, middle and index fingers. The left index finger steps right for G and the right index finger steps left for H; then J, K and L fall to the right index, middle and ring fingers. The right little finger rests on the semicolon and types nothing. Run it backwards and the first key, L, falls to the right ring finger.
Questions and answers
What does asdfghjkl mean?
As a word, nothing. It is internet slang for a moment when emotion leaves the writer incoherent, typed by sliding a finger along the keys. The letters are the middle row of a QWERTY keyboard, left to right, then the semicolon and apostrophe keys.
Why is the asdfghjkl keyboard row called the home row?
Touch typists rest eight fingers on it, on A S D F and J K L ;, and bring each finger home after a reach to another row. On most keyboards F and J carry a raised dot or bar to find by feel.
Why do some people type asdfghjkl;'# with a hash?
Their keyboard has the UK layout, where the hash key sits between the apostrophe and Enter. Slide along a US keyboard and the last character before Enter is the apostrophe.