Well, I'm certainly confused!
You've (presumably) got the payslip in front of you. You can read any codes or abbreviations alongside the deductions. You know which things your employer might deduct things for (such as a company pension scheme or union payments). But YOU don't know what the deductions are for.
We, on the other hand, can't see your payslip. We can't read any codes or abbreviations alongside the deductions. We don't know what your employer might make deductions for. Yet you expect US to know what you don't!!!
If you want a useful answer you'll have to provide a bit more information!
Chris
PS: As a starting point, nearly every pay slip will show deductions for PAYE and National Insurance. Union fees (if deducted straight from your pay) and pension contributions are also frequently seen on payslips, as are things like charity donations (where you've agreed to deductions from your pay). You might also see deductions to 'get things straight' after a previous discrepancy. For example, some firms work out their week's wages on a Thursday, assuming that staff will turn up on the Friday. If they don't actually do so, a deduction will be made from their following week's pay.