|  in Spanish Sign Language from Madrid  in Spanish Sign Language from Madrid | Single Finger-Trills Unspecified alternating of the fingers, one at a time opening
      or closing in one direction. The Single Finger-Trill Symbols do not tell you which finger
      opens first. Instead they generally inform the reader that there
      is one trill of the fingers, either opening or closing.  Although the Finger-Trill Symbols were available on the SignWriter
      Computer Program keyboard in 1995, their first use was documented
      in Madrid, Spain around 1998.  | ||||||
| 
 | Multiple Finger-Trills Unspecified alternating of the fingers multiple times up and down. One finger closes, then the next finger closes, then the next
      and the next, and then it all reverses direction. This is a multiple
      trill. The symbol does not give detailed information. There is
      no way to know which finger started the trill, or which one finished. | 

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