text: In syntax, this letter denotes "thematic roles" such as agent, experiencer, source, and goal, which are assigned by verbs to nouns in a namesake "grid."
full_question: In syntax, this letter denotes "thematic roles" such as agent, experiencer, source, and goal, which are assigned by verbs to nouns in a namesake "grid." The sound denoted in IPA by this letter emerged in Germanic languages as a sound shift from voiceless dental stops in the last stage described by Grimm's Law. In the International Phonetic Alphabet and the alphabet from which it originated, this letter now denotes a voiceless dental fricative. Originally derived from a Phoenician letter resembling a wheel, this letter has a value of 9 in Greek numerals. For 10 points, name this consonant found before iota in the Greek alphabet, which represents in one letter a sound that English requires two consonants to spell.
first_sentence: In syntax, this letter denotes "thematic roles" such as agent, experiencer, source, and goal, which are assigned by verbs to nouns in a namesake "grid."
raw_answer: theta [or theta-roles; or theta-grid] 