The various @#x sizes when uploading emoticons are used for display on various screen pixel densities, rather than actually showing the emoticon at different sizes.
For example, the @2x version of the image is used on most mobile devices to show a higher resolution version of the emoticon (but at the same visual size, so it looks "sharper"). Likewise, @3x and @4x versions are used on progressively more dense screens as appropriate.
These sizes get used automatically based on the pixel density. Emoticons will always display (in visual terms) at the size of the @1x version on your screen, but may have higher resolution based on whether or not your viewing them on a high-dpi screen. The fact that they display at different visual sizes when uploading is just a way to indicate whether there will be high-dpi versions of the image available after you upload.
I agree with Bhavin. This is pretty unusable for computer based HipChat because the emoticons are so small. For instance, if I want to use a gif file that is visible, I have to either upload an attachment or use "Sassy." Would be great to just have bigger emoticons.
...have mention name FirstnameLastname. Fe.: @MaartenCautreels This certainly helps to know who is being mentioned in a conversation. Imagine your colleague sends the following message...
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