。
My insurance policy number is PC2357.
Literal
Insurance-certificate number [topic-は] PC2357 is (polite).
Demonstrates mixed-script content: Japanese sentence with a Latin-letter + Arabic-numeral code. Full-width forms (Ｐ, Ｃ, ２, ３...) are common in formal documents — the width matches the Japanese characters, but the letters/digits are still Latin. In transliteration, these are read as individual characters: 'ピー・シー・に・さん・ご・なな.'