def find_non_numeric(in_col):
    
    """
    Finds each unique entry in an iterable that cannot be typecast as float and returns a list of those entries.
    """
    
    non_nums = []
    for item in in_col:
        try:
            float(item)
        except:
            if item not in non_nums:
                non_nums.append(item)
    return non_nums