graphics - What does uv.zw mean in HLSL? -

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I am trying to use HLSL code as the basis for an experiment, but I do not know the UV . It shows: 

  float4 uv0: TEXCOORD0 ... uv0.zw;   
 UV is not just 2? I know UVAVE 3 supports, but what is the fourth component? Alpha?  
 In online examples, I used to only  TEXCOORD0   float2  values,  float4  was not found.

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