ðə mˈeɪtɹɪks ɪz kˈɔːld ðə kˈælmən ɡˈeɪn ʌvðɪ ɐsˈoʊsɪˌeɪɾᵻd kˈælmən fˈɪltɚ ɹˌɛpɹᵻzˈɛntᵻd baɪ ðə fˈɜːst ᵻkwˈeɪʒən.
The matrix  is called the Kalman gain of the associated Kalman filter represented by the first equation.