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While the Play/Pause symbols aren’t native to computers, they’ve made their way onto keyboards, media players (real and virtual), and every other device capable of playing audio or video.  雖然播放/暫停 符號並不是原生於電腦的,不過他們已經被放到了鍵盤、媒體播放器(軟體或硬體的),以及任何可以播放聲音與影像的裝置上。

Unfortunately, neither the right-pointing triangle nor the double pause bars seem to have a definitive origin. They first appeared as tape transport symbols on reel-to-reel tape decks during the mid-1960s. In some cases, they were accompanied by the (double triangle) rewind and fast forward symbols. 

不幸的是,無論是右向三角型或是雙暫停直條似乎有個明確的來源。他們首先在1960年代中期的卷帶式磁帶機上以磁帶傳輸符號出現。在某些情況下,他們跟著雙三角形的倒帶符號與快進符號一起出現。

The direction of the play arrow indicated the direction the tape would move. Easy. 

Play的箭頭方線代表磁帶行進的方向,就是這麼簡單。

via The Secret Histories of Those @#$%ing Computer Symbols