I'm from the US of A, (Oregon) certified to teach K-9, and I have an endorsement to teach students with handicapping conditions in grades K-12. Overseas, Special Education is generally called, as you noted, SEN. Other names include Special Needs, SpEd or even ESL. Most jobs advertised as ESL want an ESL endorsement, although some schools will hire a teacher who has Special Ed (or English) experience only. You should probably just list your qualifications, degrees, experience, endorsements, etc. Then when you see a job that you want, structure your cover letter using the school's terminology and requirements. There aren't any internationally recognized standards as far as I know.