Double vowels (e.g., /aa/, /ii/, /uu/, /ee/ and /oo/) in katakana are written with a vowel extender symbol . For example, ああ is usually written as アー, not as アア. Click the audio icons below to hear the pronunciation of katakana words.

►	カード	/kaado/	card
►	キー	/kii/	key
►	スーパー	/suupaa/	supermarket
►	ケーキ	/keeki/	cake
►	コーヒー	/koohii/	coffee

Double consonants in katakana are written in the similar way as those in hiragana. That is, double consonants or a pause in speech (e.g., /kk/, /dd/, /pp/, /tt/, etc.) are represented by a small (half-height) katakana ッ as shown below. For the double consonant /ss/, instead of a pause in air flow, a continuous fricative sound /sss.../ is usually used (See below).

►	ホッケー	/hokkee/	hockey
►	グッドラック	/guddorakku/	good luck
►	ハッピーエンド	/happiiendo/	happy end
►	バスケットボール	/basuketto booru/	basket ball
►	ハッスル	/hassuru/	hustle

Exception: Like the hiragana character ん, the katakana ン represents a syllabic /nn/ sound and is NOT considered as double consonants. As a result, ッ is not used to transcribe this sound. See below.

►	アンナ	/ann na/ = /an'na/	Anna
►	ランニング	/rann ningu/ = /ran'ningu/	running