Translation of "verschiebbare Adresse" into English

In programming, an address that is to be adjusted to reflect the actual place in memory into which a program is loaded for execution. In "Get the byte located 12 bytes from this instruction," the address is relocatable; in "Get the byte located at address 255", the address is not relocatable. This convention is comparable to describing the "address" of a parked car as "level 2, row G" on one day and "level 5, row B" on another.