Basic knowledge of electronic components (1) - resistance
The obstruction effect of the conductor on the current is called resistance, expressed by the symbol R, the unit is ohms, kilohm, megohm, respectively, expressed by Ω, KΩ, MΩ. First, the type naming method of resistance:
The model of the domestic resistor is composed of four parts (not applicable to sensitive resistors). The first part: the main name, represented by letters, indicates the name of the product. For example, R indicates resistance and W indicates potentiometer. The second part: the material, represented by letters, indicates what material the resistor is composed of, T-carbon film, H-synthetic carbon film, S-organic solid, N-inorganic solid, J-metal film, Y-nitridation film, C-deposition film, I-glass glaze film, X-wire wound. The third part: classification, generally represented by numbers, individual types are represented by letters, indicating what type the product belongs to. 1-ordinary, 2-ordinary, 3-UHF, 4-high resistance, 5-high temperature, 6-precision, 7-precision, 8-high voltage, 9-special, G-high power, T-adjustable. The fourth part: serial number, expressed by numbers, indicates different varieties of similar products to distinguish the appearance size and performance indicators of the product, such as: R T 1 1 type ordinary carbon film resistor
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So your W stands for potentiometer.