When a student is finishing a Bachelor in Sc. Aviation, how many stripes does a student have? Can a student have stripes during his bachelor graduation or do they have to go through other PPL courses?
Stripes don't have any standardized meaning in between companies. If a company wanted, it could give one stripe to its most senior captains and four stripes to the office dog.
If your employer or your school has issued you a uniform, then the number of stripes that you have is the number of stripes that they decided to put on that uniform. If you haven't been issued a uniform, then you don't have any stripes.
Outside the military, stripes mean nothing. They are not earned rank. Each company and/or school gets to decide how their uniform looks and what is on them. There is no industry-wide regulation. If (and this is a big if) a Part 61 school has a uniform, it is usually a polo shirt and anything but jeans. Same with university programs. If you are in a Part 141 school, they decide what the stripes mean for their school. If you are working professionally in the industry then the stripes go as follows:
4 stripes equals captain regardless of type or level of experience.
3 stripes equals everyone else regardless of type or level of experience.
2 stripes equals the ever increasingly rare species called the flight engineer. They are nearly extinct.
1 stripe is not really used in the airline industry. It is sometimes used to signify a pilot trainee in some schools.
0 stripes means the company does not use stripes for your position.
Polo shirt equals cushy corporate job. Cayman Islands, here we come.
Remember, some people CHOOSE not to be captains. If you are a high seniority first officer, you go to the bottom of the captain seniority list as soon as you become a captain. That may be why they call it an upgrade instead of a promotion like they do in the military. Remember the name Jeffrey Skiles, a highly trained, skilled, and experienced pilot who contributed his teamwork to the Miracle on the Hudson.
Graduating from a University with an aviation degree does not make you a pilot. There are many different NON-FLYING aviation degrees. The professional pilot tract of a university would get you a degree as well as the appropriate pilot certificates (PPL, Instrument, multi, comm-single, comm-multi, and possibly CFI/CFII/MEI). You would have to fly with an instructor as well as take university classes. The cost of the flight hours is usually in addition to your regular tuition.