RCT stands for Radar Capture Technology — a radar-reflective mark applied on the ball's casing layer that helps Trackman capture the most accurate possible swing and flight data.
Shaft flex is how much a golf shaft bends during your swing, and how much club head speed is needed to bend it the intended amount.
A shaft profile is how flex and stiffness are distributed along the shaft from grip to tip, engineered by the manufacturer for specific swing conditions.
Torque is how much a shaft twists through the swing. Higher torque shafts feel more flexible and generally suit slower swing speeds; lower torque shafts feel stiffer and generally suit faster swing speeds.
Smash factor is ball speed divided by club speed, a Trackman metric that describes how efficiently club speed is converted into ball speed.
Spin rate is how fast the ball rotates after impact, measured in RPM.
SST PURE is a process that measures a shaft's 360-degree construction to identify its most consistent reaction point, so the club is built and oriented for maximum consistency, accuracy, and distance.
Swingweight is a measurement of how a golf club's weight is distributed and how heavy the clubhead feels relative to the grip when the club is swung.