Keywords

        &allocated : i1,i2,i3,i4    # accumulated bytes allocated
                                    # (total,static,string,block)
        &ascii : c                  # cset of ascii characters
        &clock : s                  # current time of day
        &collections : i1,i2,i3,i4  # collection count
                                    # (total,static,string,block)
        &cset : c                   # cset of all characters
        &current : C                # current co-expression
        &date : s                   # current date
        &dateline : s               # current date and time
        &digits : c                 # cset of digits 0-9
        &dump : i                   # if non-zero, causes dump on termination
        &e : r                      # base of natural logarithms, 2.71828...
        &error : i                  # run-time error conversion control
        &errornumber : i            # run-time error number
        &errortext : s              # run-time error message text
        &errorvalue : x             # run-time error offending value
        &errout : f                 # standard error output file
        &fail                       # fails
        &features : s1,s2,...,sn    # implementation features
        &file : s                   # current source code file name
        &host : s                   # string identifying host computer
        &input : f                  # standard input file
        &lcase : c                  # cset of lower case letters a-z
        &letters : c                # cset of all letters A-Za-z
        &level : i                  # level of current procedure call
        &line : i                   # current source code line number
        &main : C                   # main co-expression
        &null : n                   # the null value
        &output : f                 # standard output file
        &phi : r                    # The golden ratio, 1.61803...
        &pi : r                     # The value of pi, 3.14159...
        &pos : i                    # string scanning position
        &progname : s               # file name of the executing program
        &random : i                 # random number seed
        &regions : i1,i2,i3         # current region size
                                    # (static,string,block)
        &source : C                 # activator of current co-expression
        &storage : i1,i2,i3         # current bytes allocated
                                    # (static,string,block)
        &subject : s                # string scanning subject
        &time : i                   # current run time in milliseconds
        &trace : i                  # procedure tracing control
        &ucase : c                  # cset of upper case letters A-Z
        &version : s                # version of Icon