I think that it's pretty universal that 4 Bars = Captain, but 1,2, and 3 Bars depend largely upon the operator.
In SIA, it's as follows -
1 Bar = Second Officer, cannot operate unless a fully qualified First Officer is also present on the Flight Deck.
2 Bars = Junior First Officer, fully qualified.
3 Bars = Senior First Officer (nominally after 4 years as F/O).
In some airlines 3 Bars = Captain on a non-jet aircraft. When I once did a ferry flight of a Turbo-Prop from the U.K. to Australia, the company gave us 4 Bars on "temporary" loan, with the rationale that in most other countries nobody took any notice of anyone wearing less than 4 Bars.
About the 5 Bars, where can I get them?
Regards,
Old Smokey