Unfamiliar character in SQL statement

SELECT
    CASEID,
    GetNoteText(CASEID)
FROM
(
    SELECT
        CASEID
    FROM
        ATTACHMENTS
    GROUP BY
        CASEID
) i
GO

SELECT
    c.CASEID, c.CASE_NAME,
    a.COUNT AS ATTACHMENTSCOUNT, o.COUNT as OTHERCOUNT,
    dbo.GetNoteText(c.CASEID)
FROM CASES c
LEFT OUTER JOIN
(
    SELECT
        CASEID, COUNT(*) AS COUNT
    FROM
        ATTACHMENTS
    GROUP BY
        CASEID
) a
ON a.CASEID = c.CASEID
LEFT OUTER JOIN
(
    SELECT
        CASEID, COUNT(*) AS COUNT
    FROM
        OTHER
    GROUP BY
        CASEID
) o
ON o.CASEID = c.CASEID

SELECT DT1.CASEID, GetNoteText(DT1.CASEID)
FROM (
   SELECT CASEID
   FROM ATTACHMENTS
   GROUP BY CASEID
) AS DT1 (CASEID);