Arp

The small white squares painted above the footboard at the ends of S.R. passenger coaches were a wartime addition to show that the lighting arrangements of vehicles so marked had been altered to conform to A.R.P. regulations.

"The arp can be applied to instruments by inserting it as a MIDI effect before your synth of choice."

All through the prayer he made little arp! arp! noises like a baby seal.

"ARP, ARP, ARP." George turned and saw the seal waddling down their side of the river.

Usually when I speak about arp [address resolution protocol], at least one person in the audience acts like a seal and shouts, "Arp, arp, arp!"