reuse
using an item again after it has been used, instead of recycling or disposing
found footage
use of footage as a found object
toner refill
refilling of laser printer toner cartridges
code reuse
use of existing source code to build new software
waste reuse
reuse or repurposing of waste material
cannibalization
practice of removing parts for repairing a similar machine
adaptive reuse
reuse of an existing building for a new purpose
desecration
act of depriving something of its sacred character
palimpsest
manuscript page that's been used multiple times