The ISTQB scheme has four levels and 27 current exams. Every one of them starts with CTFL. Here is how the levels connect, what each branch requires, and which second exam fits your job.
ISTQB has issued more than 1.1 million certificates, which settles the question of recognition and nothing else. What the exam actually measures, what it costs, which syllabuses are retiring, and four questions to ask before you pay.