calculator, arithmetic, logarithms, protractors, pencil, pendulums, pythagorean theorem, electric typewriter, diabolo, algebraic, chopsticks, equations, pianola, sextant, origami, typewriting, erasers, homophones, decimal, trigonometry, theorems, mathematical, quadratic equation, mathematicians, dowsing rod, yantra, blackboard eraser, mnemonics, polynomials, mathematic, inkwells, palmistry, maths, mathematics, chessboards, ballpoints, trig, divination, typewriters, shogi, sharpener, spirograph, astrolabe, blackboards, combinatorics, kanji, leonardo fibonacci, milking stool, oracle, alphabets, sewing machine, thingamabob, calculations, treadle, crayon, quill pen, brail, sutras, sleigh bell, adz, spreadsheet, stud finder, farthings, paperclips, ocarina, netsuke, pinecone, differential calculus, prayer beads, computations, mimeograph, stopwatch, noughts, boolean algebra, clicker, beads, tangram, moneybox, zithers, daoism, thimbles, allen wrench, gramophone, cloisonne, metronome, imaginary, adze, mandarin dialect, brainwork, boolean logic, magic, scrabble, eggbeater, subtraction, cosines, thermos flask, mercator projection, samisen, katakana, hourglasses, plaiting, awl, plinth, cornice, wooden, pedestal, piers, pillars, entablature, loom, pilaster, pilasters, podium, architrave, balustrade, buttresses, chimney, lintel, chisel, fireplace, pier, adobe, 2d, comparison, compressible, fourdimensional, incompressible, oblate, symmetry, uncapped, zodiac, above, aplanatic, arabic, ary, atlas, atom, axisymmetric, benchmark, bestknown, bilinear

echinus

calculating machine, calculator, tablet