It is the black keys of a piano
On a side note, The tattoo is not an original idea, I was in court
with my 17 year old daughter since she found out that batting your
eyes and crying do not always work when trying to avoid a speeding
ticket.
Anyway, on the side sitting there was someone there with the tattoo
described. I went over to him and asked "Piano?" He looked at me and
said, "no one ever guesses piano, they all think it is a bar code." I
told him it was obviously a piano and a very unique tattoo. The rest
is, well, history.
Of course my dermatologist who just removed a golf ball size chunk of
meat from my back does not think it a good idea to get another
tattoo... (oh the joys of getting old, and all you little snots out
there will have to go through it too)