While it does seem unbelievable that there are a large number of text abbreviations, keep in mind that different chat abbreviations are used by different groups of people. For example, online gamers are likely to use text abbreviations not used by a financial blogger. Numbers & Characters A B ...
Any PDS MFG is going to list what it can take on it's spec page. If it takes SDHC, it will generally accept *most* SDHC unless otherwise noted with a restriction (i.e. up to 8gb only). Your PC does not need to "have" SDHC compatibility -- the *device reading* the SDHC card...