Prefix division by following unit selbri
Cf. pi'ai, te'ai, 1/n, "n/" => n/1, or "/" alone => golden ratio.">fi'u. Essentially attaches "te'ai ni'u pa" to all subsequent unit-selbri in the tanru. E.g. "pi'ai ki'otre fei'u cacra" = "pi'ai ki'otre cacra te'ai ni'u pa" = "kilometers per hour"; "pi'ai mitre fei'u snidu snidu" = meters per second per second. May even be used without pi'ai: "fei'u snidu" = reciprocal of the second / hertz