Could you please explain to me what is tetra ttrl? i received this vaccination when i was a baby

No: More details would help, such as how many times a person received it, at what ages, in what country, who manufactured it, etc... One possibility is that it was a vaccine to protect against 4 diseases such as tetanus, diphtheria, pertussis (whooping cough), and polio. However, there exist several types of combinations of "tetravalent" vaccines that protect against 4 things.