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Abacuses (or abaci, both are acceptable plurals). I've got them in wood, brass, jade, ivory, one over a meter long, a usable one that's 5 cm, silver cufflinks that are just 2 cm (and not usuable, except with a toothpick perhaps). I've got some very old ones and very modern ones. I've got 5-2s, 5-1s and 4-1s (number of beads on each rod), a few big russian ones with 10 on each rod. My favorite is one used by the blind, with felt backing so that the beads stay put so you can feel the position without disturbing where they are. I was really into the about 20 years ago. I don't play with them much anymore, but they are great decor and will soon be decorating my math park (former viking camp).