backing
backing-out
backing-up
backlash
back-link
backlog
backoff
back-office
backout
back-panel
  backplane
backprojecting
backrolling
backslant
backslash
backslat
backspace
backspark
back-to-back
backtrace
backtracking

    backplane bus

    монтажная шина, шина на объединительной плате