interlocking

gears

Toothed rotating machine parts

• cogsProjections on a wheel
• sprocketsToothed wheels for chains
• jointsSkeletal connection points

coupling · engagement · fitting · assembly · dovetail · mortise-and-tenon · tongue-and-groove · linkage · mechanism · ratchet

tessellation

Gapless plane coverage

• mosaicInlaid pictorial arrangement
• gridFramework of intersecting lines
• latticeOpenwork of crossed strips

trellis · chainmail · filigree · basketweave · herringbone · parquet · brickwork · tile · pavement · honeycomb

knit

Loop yarn into fabric

• crochetHooked needle needlework
• laceOpen-weave ornamental fabric
• macraméFiber art using knots

netting · tatting · chainmail · meshwork · webbing · stitching · looping · yarn · linking · cable knit

snap

Sudden sharp sound

• clickBrief sharp noise
• claspSecuring device that clicks
• buckleFrame-and-prong fastener

zipper · latch · tab · hook · clip · velcro · button · closure · connector · fitting

dovetail

Join by interlocking parts

• mortiseCarved slot for joining
• tenonProjecting joint piece
• rabbetStepped edge recess

lap · scarf · finger · box · dado · groove · slot · biscuit · tongue-and-groove · splice

interdependence

Reciprocal reliance between entities

• interconnectionMutual joining of parts
• integrationCombining into a whole
• synergyCombined effect exceeding components

cohesion · unity · coordination · symbiosis · reciprocity · mutual · cooperation · collaboration · alliance · network

switch

Circuit-breaking toggle device

• turnoutNumber attending an event
• pointsUnits of tally
• crossoverGenre-blending work or transition

junction · track · rail · gauge · sleeper · frog · siding · marshalling

• mechanicalhydraulic, pneumatic, spring-loaded, motorized, belt-driven
• patternspattern, chevron, geometric pattern, stripes, plaid
• arrangementsarrangement, orchestration, arranged, array, configuration
• hand positionsopen hand, closed hand, fist, flat hand, cupping
• pattern traitsregularity, symmetry, repetition, uniformity, variation
• railway infrastructurerailway station, train station, platform, tracks, rails