The procedures and results of a national study to measure the familiarity of 1165 pre-calculus mathematical terms and 154 mathematical symbols are reported. Unique tests of 100 randomly selected mathematical terms as well as unique tests of 36 randomly selected mathematical symbols were generated by a computer. The familiarity of each term was based on the responses of approximately 350 students. The familiarity of each symbol was based on the responses of approximately 250 students. The student sample consisted of approximately 5,500 seventh and eighth graders from 36 schools. The schools were chosen nationwide by a proportionate stratified random sampling plan. Measures of the familiarity of mathematical terms and symbols were established. (Author/CT)