Rebbuqqan - Rebbuqqan was a divinatory script read by priestesses of the Toad-Goddess Rebbuqqa from the flight of flies. In the profane form known outside the Temple, the script is defective and does not supply characters for every phoneme: for example, /b/ could also mean /v/ or /m/, /p/ could mean /f/, and /j/ (as in German or Italian) could mean /i/ or /î/. The script had no written form and was reproduced in the Temple from memory by means of sticks dipped in the luminous spores of various fungi and waved in darkened scriptoria.

Remeba - Left-to-right horizontal (on a line), top-to-bottom (of a page) back-to-front (in a book... and yes, that's backwards for us...)

"b" includes b, p, v, and f, and anything in between
"?" includes ? and ?
"z" includes z and s
"?" includes ? and ?
"d" includes d and t
"ð" includes ð and þ
"g" includes g, k, q, and anything in between
"(silent)" includes silent, w, h, and anything in between

Rhynar

Rikchik - Seven lines per word: four specify the morpheme, with one each for aspect of meaning, relation to other words in the sentence, and for how many previous words the word relates to. See the site for more information.

rMjun-bsPa - This is a linearized Tibetan-style script. Tones are marked in a very complex manner, using the three tone marks in combination with unpronounced consonant letters at the beginning of each syllable.

Rotor - Rotor is an experimental script created using animated gifs, to realize the concept of letters that literally move on the "page". It consists of fifteen minimal pairs of graphemes in which the members of each pair are identical except for the way they move: unvoiced consonants and the first member of the pairs /l r/, /h j/, /q x/, /a o/, ". :", ", ;", "! ?" turn clockwise, voiced consonants and the second member of the pairs move anti-clockwise (/c/ rocks first clockwise, then anti-clockwise). Of the remaining graphemes, /e/ turns a vertical figure-of-eight and /u/ a horizontal one, and /i/ alone, consisting of two "zoophors" turning clockwise, is unambiguous when at rest.

Rowenian