Echo...

"Black.Jack you say?"
"... why, yes, indeed I do play."

777 = 21 = U
666 = 18 = R
555 = 15 = 0 (dot)
444 = 12 = L
333 = 9 = I
222 = 6 = F
111 = 3 @ ' E'

Seven days a 'week'.

111 as binary = 7 Hex, 7 Dec, 7 Oct

...arrangements...

U R L I F 'E'
21 +18+ 12 + 9 + 6 + 3 = 69

777 = U and 333 = I

666 = R
555 = @
222 = F
444 = L

111 = C?

222 = F
555 = O
777 = U
666 = R

and four D four more...

444 = 12 = '@urs' @ 21 Jack.