Unused Objects.
SuperMarioBrosBrownBall
An object that Mario can climb up or down like a vine. It makes a "buzzing" sound as you climb, as though Mario is repeatedly hitting his head on something. It can still be placed in-game with a level editor. Although it appears as a brown flagpole ball, the actual 16×16 metatile that is used is unique to this object.
Iink here : https://tcrf.net/Super_Mario_Bros.
I found that objects is actually FlagPole's top with object value of 0x31 containing at offset 0x0016.
Here is my tweet about it. https://twitter.com/haseeb_heaven/status/831679215783120897
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